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the belief in and worship of a superhuman controlling power, especially a personal God or gods:

宗教, 信仰(心)

e.g. ideas about the relationship between science and religion.

a particular system of faith and worship:

(個別の)宗派, 宗教

e.g. the world's great religions.

a pursuit or interest to which someone ascribes supreme importance:

〖単数形で〗(異常なほどの興味を持つ)生きがい, 命; 信条

e.g. consumerism is the new religion.

informal be converted to religious belief and practices.

religionless adjective

Middle English (originally in the sense ‘life under monastic vows’): from Old French, or from Latin religio(n-) ‘obligation, bond, reverence’, perhaps based on Latin religare ‘to bind’.